population

population growth

is, when unchecked, bound to increase in a geometric ratio while subsistence increases only in an arithmetical ratio.

Population, when unchecked, increases in a geometric ratio. Subsistence increases only in an arithmetical ratio.

is the idea that the power of population is indefinitely greater than the power in the earth to produce subsistence for man.

The power of population is indefinitely greater than the power in the earth to produce subsistence for man'.[5]